divided by recent authors, more properly only deserve the systematic rank of 

 subfamilies, and no such division has been carried out of the Conchoeciidce, I 

 have come to the result, that only 2 true families are to be distinguished within 

 the suborder Myodocopa. The one of these families has been treated of in the 

 preceding pages, the other is that here in question. As to the name of the 

 family, I think that the one here given and proposed by me in the year 1865, 

 ought to be preferred to that generally used by recent authors, H alley pridce. 

 For, according to the general law in Zoology, the family-name should always 

 be derived from that of the genus at first established, and the generic name 

 Conchoecia was in reality proposed by Dana 2 years previous to that of 

 Halocypris. 



All the forms belonging to the present family lead a true pelagic life, 

 occuring not seldom in shoals near the surface of the sea, in other cases 

 however only at greater depths; but they are newer so strictly, bound to the 

 bottom as is the case witht the Cypridinidce. The weak consistency of the shell, 

 in connection with the very powerfully developed swimming antennae, seems 

 indeed to be very apt for facilitating the free movements of the animal. 



To the 2 genera, Conchoecia and Halocy pries originally established by 

 Dana, a limited number of additional genera have been recorded in recent 

 times, most of them closely allied to the first-named genus and in some cases 

 only founded on slight differences in the shape of the shell. Only the typical 

 genus is represented in the Fauna of Norway. 



Gen. 4. Conchoecia, Dana, 1849. 



Generic Characters. Shell more or less elongate in shape and not very 

 tumid, with the dorsal face almost plain and continued anteriorly in the beak- 

 like rostral projections; subjacent sinus well marked and rather wide. Surface 

 of shell without any obvious clothing of hairs, in some cases apparently 

 quite smooth, but more generally sculptured with delicate curved striae often 

 crossing each other, so as to form a more or less dense net-work. Anterior 

 antennae in female straight, sub-cylindrical, imperfectly jointed, carrying on the 

 tip a bundle of generally 4 subequal sensory filaments accompanied in front 

 by a slender upward-curving seta; those in male much larger, and distinctly 

 4-articulate, with the apical appendages conspicuously transformed. Posterior 

 antennae with the basal part exceedingly large, obpyriform in shape, outer 

 ramus 7 9-articulate, with the 1st joint more than twice as long as the 



